This complete upper includes our new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Our proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

Includes:

M4E1 Threaded Assembled Upper Receiver

ATLAS S-ONE Handguard of choice

16" 5.56 Mid Pencil CMV Barrel

Low Profile Gas Block and Mid-Length Gas Tube

Product comes assembled

This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the FINISH YOUR BUILD tab

M4E1 Threaded Upper Receiver Features:

New enhanced forging that gives the upper receiver a "billet look"

New picatinny profile that blends seamlessly with our Enhanced Series Handguards